@book { StrategischeUnternehmensfhrung,
    title = "Strategische Unternehmensführung",
    author = "Ingolf {Bamberger} and Thomas {Wrona}",
    year = "2013",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220801"
}